In the hills of Pennsylvania, phantoms from the past mingle with those of the present, all swirling in a dark maelstrom over Division. Haunted by the part he played in his brother Mark's death, John McDonnell takes a midnight hike and stumbles across four dead girls upon the forest floor. Their severed limbs spell Repent. The coroner finds Mark's onyx skeleton key inside one of the victims, right where her heart used to be. The last time John had seen the key it was clasped in his brother's hand before they lowered him into his grave.

Torn between protecting his family's name and giving the girls a proper burial, John digs into Division's past. As lives shatter around them, and a strange woman tries to steal the key, John and his best friend, Michael Johnston, must find the tools to set things right or break beneath the pressure of these ghosts' sudden weight.